System information updating method, apparatus, and system

ABSTRACT

A system information updating method, a user equipment and a base station are provided, the method including: receiving, by the wake-up radio (WUR) interface of the user equipment, a wake-up signal sent by the base station, where the wake-up signal is used to wake up a main radio interface of the user equipment and instruct the main radio interface of the user equipment to receive updated system information, the wake-up signal includes system information (SI) update transmission control information, and the SI update transmission control information includes information required for receiving the updated system information; waking up, by the WUR interface of the user equipment, the main radio interface of the user equipment; and receiving, by the user equipment according to the SI update transmission control information through the woken-up main radio interface, the updated system information sent by the base station.

This application is a national stage application of InternationalApplication No. PCT/CN2019/072617, filed on Jan. 22, 2019, which claimspriority to Chinese Patent Application No. 201810404775.3, filed on Apr.28, 2018 and Chinese Patent Application No. 201810099650.4, filed onFeb. 1, 2018. All of the aforementioned applications are herebyincorporated by reference in their entireties.

TECHNICAL FIELD

Embodiments of this application relate to the field of informationtechnologies, and in particular, to a system information updatingmethod, an apparatus, and a system.

BACKGROUND

In the 3rd generation partnership project (3GPP) standard, userequipment (UE) is configured with a wake-up radio (WUR) interface on thebasis of a traditional main radio interface, as shown in FIG. 1. Themain radio interface is also called a main radio module, and the WURinterface is also called a WUR module. After the UE is configured withthe WUR module, when the main radio module in an inactive state receivesa trigger signal from the WUR module, the main radio module enters anactive state, and then the UE performs data communication with a basestation through the main radio module. The trigger signal is an internalsignal of the UE and can be transmitted wiredly or wirelessly.

In the prior art, in a long term evolution (LTE) system, when systeminformation of a cell changes, a base station needs to broadcast thechange of the system information to UE, and a main radio module of theUE undergoes three steps: reception of a paging message, reception of asystem information block (SIB) 1, and reception of SIBs 2 to 21, toupdate the system information. The SIBs 2 to 21 may be called othersystem information (OSI) in a new radio (NR) system, and a quantity ofsystem information blocks included in the OSI is less than or equal to aquantity of the SIBs 2 to 21. Each step undergoes corresponding downlinkcontrol information (DCI) blind detection with high power consumption.In addition, as the UE is configured with a WUR module, if the WURmodule is in an active state, the UE may be out of synchronization dueto crystal frequency drift, so that the UE is unable to receive amessage from the base station in a paging window known to both the UEand the base station. Therefore, before the main radio module of the UEis woken up by the base station for updating the system information,cell synchronization also needs to be performed, which further increasespower consumption of the UE and increases latency. System information ofan NR system is supposed to be updated more frequently than that of anLTE system, and therefore power consumption of UE in the NR system isgreater than that of UE in the LTE system.

In conclusion, in the LTE or NR system, when UE is configured with a WURmodule, how to reduce power consumption of the UE during systeminformation updating is a problem that needs to be resolved for now.

SUMMARY

Embodiments of this application provide a system information updatingmethod, an apparatus, and a system, to resolve a prior-art problem thatUE consumes a large amount of power during system information updatingwhen the UE is configured with a WUR module.

According to a first aspect, embodiments of this application provide asystem information updating method. The method includes: sending, by abase station, a wake-up signal to a wake-up radio WUR interface of userequipment, and waking up, by the user equipment, a main radio interfaceof the user equipment after the WUR interface of the user equipmentreceives the wake-up signal, where the wake-up signal is used toinstruct the user equipment to wake up the main radio interface of theuser equipment and instruct the main radio interface of the userequipment to receive updated system information, the wake-up signalincludes system information SI update transmission control information,and the SI update transmission control information includes informationrequired for receiving the updated system information; and sending, bythe base station, the updated system information to the main radiointerface, and receiving, by the user equipment according to the SIupdate transmission control information through the woken-up main radiointerface, the updated system information sent by the base station.

In this method, the WUR interface of the user equipment receives thewake-up signal sent by the base station, and wakes up the main radiointerface of the user equipment based on the wake-up signal. After beingactivated, the main radio interface receives, according to the systeminformation SI update transmission control information carried in thewake-up signal, the updated system information sent by the base station.Because the system information SI update transmission controlinformation carries information required for the updated systeminformation, the user equipment may receive, according to the requiredinformation, the updated system information, that is, an updated SIB 1(with no blind check needed in the step of receiving the updated SIB 1).In this way, there is no need to go through a large quantity of blinddetection processes in two prior-art steps of performing blind detectionto receive a paging message and then performing blind detection toreceive the SIB 1, reducing power consumption of the user equipment.

In a possible design, the SI update transmission control informationincludes frequency domain resource information required for receivingthe updated system information.

In this method, the user equipment receives, according to the frequencydomain resource information through the woken-up main radio interface,the updated system information sent by the base station.

In a possible design, the SI update transmission control informationfurther includes at least one of the following information: time domainresource information required for receiving the updated systeminformation, and modulation and coding scheme information required forreceiving the updated system information.

In this method, the user equipment receives, according to the timedomain resource information and the modulation and coding schemeinformation through the woken-up main radio interface, the updatedsystem information sent by the base station.

In a possible design, the wake-up signal is a synchronization frameand/or a wake-up frame, where the wake-up frame is a broadcast frame, aunicast frame, or a multicast frame.

In a possible design, when the wake-up signal is the wake-up frame, thatthe WUR interface of the user equipment receives the wake-up signal sentby the base station includes: receiving, by the WUR interface of theuser equipment, the wake-up frame sent by the base station, where thewake-up frame includes the SI update transmission control information.

In this method, the wake-up frame received by the user equipmentincludes the SI update transmission control information.

In a possible design, the wake-up frame further includes an SI updateindication, and the SI update indication is used to indicate that systeminformation has been updated.

In this method, the user equipment determines, based on the received SIupdate indication, that system information has been updated, and thenreceives the updated system information according to the informationrequired for the updated system information carried in the SI updatetransmission control information.

In a possible design, when the wake-up signal is the synchronizationframe and the wake-up frame, that the WUR interface of the userequipment receives the wake-up signal sent by the base station includes:receiving, by the WUR interface of the user equipment, thesynchronization frame sent by the base station, where thesynchronization frame includes the SI update transmission controlinformation; and after the WUR interface of the user equipment receivesthe synchronization frame sent by the base station, receiving, by theWUR interface of the user equipment, the wake-up frame sent by the basestation, where the wake-up frame includes an SI update indication, andthe SI update indication is used to indicate that system information hasbeen updated.

In this method, the SI update transmission control information requiredby the user equipment is sent by using the synchronization frame, the SIupdate indication is sent by using the wake-up frame, and the updatedsystem information is received according to the received SI updatetransmission control information and the SI update indication.

In a possible design, when the wake-up signal is the synchronizationframe, that the WUR interface of user equipment receives the wake-upsignal sent by the base station includes: receiving, by the WURinterface of the user equipment, the synchronization frame sent by thebase station, where the synchronization frame includes the SI updatetransmission control information.

In this method, the user equipment receives the updated systeminformation based on the received SI update transmission controlinformation.

In a possible design, the synchronization frame further includes an SIupdate indication, and the SI update indication is used to indicate thatsystem information has been updated.

In this method, the user equipment determines, based on the received SIupdate indication, that system information has been updated, and thenreceives the updated system information according to the informationrequired for the updated system information carried in the SI updatetransmission control information.

In a possible design, the SI update indication is carried by a counterfield in the synchronization frame, and a value of the counter field isused to indicate that system information has been updated.

In this method, using the counter field to indicate that systeminformation has been updated is to explicitly inform the user equipmentthat system information has been updated.

According to a second aspect, embodiments of this application provide asystem information updating method, including: sending, by a basestation, a wake-up signal to a wake-up radio WUR interface of userequipment, where the wake-up signal is used to instruct the userequipment to wake up a main radio interface of the user equipment andinstruct the main radio interface of the user equipment to receiveupdated system information, the wake-up signal includes systeminformation SI update transmission control information, and the SIupdate transmission control information includes information requiredfor receiving the updated system information; and sending, by the basestation, the updated system information to the woken-up main radiointerface of the user equipment.

In a possible design, the SI update transmission control informationincludes frequency domain resource information required for receivingthe updated system information.

In a possible design, the SI update transmission control informationfurther includes at least one of the following information: time domainresource information required for receiving the updated systeminformation, and modulation and coding scheme information required forreceiving the updated system information.

In a possible design, the wake-up signal is a synchronization frameand/or a wake-up frame, where the wake-up frame is a broadcast frame, aunicast frame, or a multicast frame.

In a possible design, when the wake-up signal is the wake-up frame, thesending, by a base station, a wake-up signal to a wake-up radio WURinterface of user equipment includes: sending, by the base station, thewake-up frame to the WUR interface of the user equipment, where thewake-up frame includes the SI update transmission control information.

In a possible design, the wake-up frame further includes an SI updateindication, and the SI update indication is used to indicate that systeminformation has been updated.

In a possible design, when the wake-up signal is the synchronizationframe and the wake-up frame, the sending, by a base station, a wake-upsignal to a wake-up radio WUR interface of user equipment includes:

sending, by the base station, the synchronization frame to the WURinterface of the user equipment, where the synchronization frameincludes the SI update transmission control information; and

after the base station sends the synchronization frame to the WURinterface of the user equipment, sending, by the base station, thewake-up frame to the WUR interface of the user equipment, where thewake-up frame includes an SI update indication, and the SI updateindication is used to indicate that system information has been updated.

In a possible design, when the wake-up signal is the synchronizationframe, the sending, by a base station, a wake-up signal to a wake-upradio WUR interface of user equipment includes: sending, by the basestation, the synchronization frame to the WUR interface of the userequipment, where the synchronization frame includes the systeminformation SI update transmission control information.

In a possible design, the synchronization frame further includes an SIupdate indication, and the SI update indication is used to indicate thatsystem information has been updated.

In a possible design, the SI update indication is carried by a counterfield in the synchronization frame, and a value of the counter field isused to indicate that system information has been updated.

In a third aspect, embodiments of this application provide userequipment, including: a WUR interface, configured to receive a wake-upsignal sent by a base station, where the wake-up signal is used toinstruct the user equipment to wake up a main radio interface of theuser equipment and instruct the main radio interface of the userequipment to receive updated system information, the wake-up signalincludes system information SI update transmission control information,and the SI update transmission control information includes informationrequired for receiving the updated system information; a processingunit, configured to wake up the main radio interface of the userequipment after the WUR interface receives the wake-up signal; and themain radio interface, configured to receive, according to SI updatetransmission control information after being woken up, the updatedsystem information sent by the base station.

In a possible design, the SI update transmission control informationincludes frequency domain resource information required for receivingthe updated system information.

In a possible design, the SI update transmission control informationfurther includes at least one of the following information: time domainresource information required for receiving the updated systeminformation, and modulation and coding scheme information required forreceiving the updated system information.

In a possible design, the wake-up signal is a synchronization frameand/or a wake-up frame, where the wake-up frame is a broadcast frame, aunicast frame, or a multicast frame.

In a possible design, when the wake-up signal is the wake-up frame, theWUR interface is specifically configured to:

receive the wake-up frame sent by the base station, where the wake-upframe includes the SI update transmission control information.

In a possible design, the wake-up frame further includes an SI updateindication, and the SI update indication is used to indicate that systeminformation has been updated.

In a possible design, when the wake-up signal is the synchronizationframe and the wake-up frame, the WUR interface of the user equipment isspecifically configured to:

receive the synchronization frame sent by the base station, where thesynchronization frame includes the SI update transmission controlinformation; and

after the WUR interface of the user equipment receives thesynchronization frame sent by the base station, receive, by the WURinterface of the user equipment, the wake-up frame sent by the basestation, where the wake-up frame includes an SI update indication, andthe SI update indication is used to indicate that system information hasbeen updated.

In a possible design, when the wake-up signal is the synchronizationframe, the WUR interface is specifically configured to:

receive the synchronization frame sent by the base station, where thesynchronization frame includes the SI update transmission controlinformation.

In a possible design, the synchronization frame further includes an SIupdate indication, and the SI update indication is used to indicate thatsystem information has been updated.

In a possible design, the SI update indication is carried by a counterfield in the synchronization frame, and a value of the counter field isused to indicate that system information has been updated.

According to a fourth aspect, embodiments of this application provide abase station, including: a first transceiver unit, configured to send awake-up signal, where the wake-up signal is used to instruct userequipment to wake up a main radio interface of the user equipment andinstruct the main radio interface of the user equipment to receiveupdated system information, the wake-up signal includes systeminformation SI update transmission control information, and the SIupdate transmission control information includes information requiredfor receiving the updated system information; and a second transceiverunit, configured to send the updated system information to the woken-upmain radio interface of the user equipment.

In a possible design, the SI update transmission control informationincludes frequency domain resource information required for receivingthe updated system information.

In a possible design, the SI update transmission control informationfurther includes at least one of the following information: time domainresource information required for receiving the updated systeminformation, and modulation and coding scheme information required forreceiving the updated system information.

In a possible design, the wake-up signal is a synchronization frameand/or a wake-up frame, where the wake-up frame is a broadcast frame, aunicast frame, or a multicast frame.

In a possible design, when the wake-up signal is the wake-up frame, thefirst transceiver unit is specifically configured to:

send the wake-up frame to a WUR interface of the user equipment, wherethe wake-up frame includes the system information SI update transmissioncontrol information.

In a possible design, the wake-up frame further includes an SI updateindication, and the SI update indication is used to indicate that systeminformation has been updated.

In a possible design, when the wake-up signal is the synchronizationframe and the wake-up frame, the first transceiver unit is specificallyconfigured to:

send the synchronization frame to the WUR interface of the userequipment, where the synchronization frame includes the SI updatetransmission control information; and

after the first transceiver unit sends the synchronization frame to theWUR interface of the user equipment, send, by the first transceiverunit, the wake-up frame to a WUR interface of the user equipment, wherethe wake-up frame includes an SI update indication, and the SI updateindication is used to indicate that system information has been updated.

In a possible design, when the wake-up signal is the synchronizationframe, the first transceiver unit is specifically configured to:

send the synchronization frame to a WUR interface of the user equipment,where the synchronization frame includes the system information SIupdate transmission control information.

In a possible design, the synchronization frame further includes an SIupdate indication, and the SI update indication is used to indicate thatsystem information has been updated.

In a possible design, the SI update indication is carried by a counterfield in the synchronization frame, and a value of the counter field isused to indicate that system information has been updated.

According to a fifth aspect, an embodiment of this application furtherprovides a device, including a processor and a memory, where the memoryis configured to store a software program, and the processor isconfigured to read the software program stored in the memory andimplement the method provided in any one of the first aspect or thedesigns of the first aspect or any one of the second aspect or thedesigns of the second aspect.

According to a sixth aspect, an embodiment of this application furtherprovides a computer-readable storage medium, configured to store acomputer software instruction used for executing functions described inany one of the first aspect or the designs of the first aspect or anyone of the second aspect or the designs of the second aspect, where thecomputer software instruction includes a program designed to execute themethod provided in any one of the first aspect or the designs of thefirst aspect or any one of the second aspect or the designs of thesecond aspect.

According to a seventh aspect, an embodiment of this application furtherprovides an apparatus, where the apparatus is connected to a memory, andis configured to read and execute a software program stored in thememory to implement any one of the first aspect or the designs of thefirst aspect or any one of the second aspect or the designs of thesecond aspect, and the apparatus is a chip or a chip system.

According to an eighth aspect, an embodiment of this application furtherprovides a system, including user equipment and a base station thatimplement any one of the first aspect or the designs of the first aspectand any one of the second aspect or the designs of the second aspect.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic structural diagram of user equipment according toan embodiment of this application;

FIG. 2 is a schematic diagram illustrating a scenario of a wirelesscommunications system according to an embodiment of this application;

FIG. 3 is a schematic diagram of a WUR interface in an intermittentlyactivated state according to an embodiment of this application;

FIG. 4 is a flowchart of a system information updating method accordingto an embodiment of this application;

FIG. 5 is a flowchart of another system information updating methodaccording to an embodiment of this application;

FIG. 6 is a flowchart of still another system information updatingmethod according to an embodiment of this application;

FIG. 7 is a flowchart of yet another system information updating methodaccording to an embodiment of this application;

FIG. 8 is a schematic diagram of receiving updated system informationaccording to a prior art and an embodiment of this application;

FIG. 9 is a schematic diagram of a user equipment apparatus according toan embodiment of this application;

FIG. 10 is a schematic diagram of a base station apparatus according toan embodiment of this application;

FIG. 11 is a diagram of a hardware structure of user equipment accordingto an embodiment of this application;

FIG. 12 is a diagram of a hardware structure of a base station accordingto an embodiment of this application; and

FIG. 13 is a schematic diagram of a system according to an embodiment ofthis application.

DESCRIPTION OF EMBODIMENTS

The following further describes in detail the embodiments of thisapplication with reference to the accompanying drawings.

The embodiments of this application provide a system informationupdating method, an apparatus, and a system, to resolve a prior-artproblem that UE consumes a large amount of power during systeminformation updating when the UE is configured with a WUR module. Themethod and the device are based on a same inventive idea. Becauseprinciples of resolving problems according to the method and the deviceare similar, mutual reference may be made between implementations of thedevice and the method, and repeated content is not describedredundantly.

In the following, some terms in the embodiments of this application aredescribed, to help a person skilled in the art have a betterunderstanding.

(1) User equipment (UE), also known as a terminal equipment, a mobilestation (MS), a mobile terminal (MT), or the like, is a device thatprovides voice and/or data connectivity to users, for example, ahandheld device, a vehicle-mounted device, or the like that has awireless connection. Currently, some examples of the terminal are amobile phone (mobile phone), a tablet, a laptop, a handheld computer, amobile internet device (MID), a wearable device, a virtual reality (VR)device, an augmented reality (AR) device, a wireless terminal inindustrial control, a wireless terminal in self-driving, a wirelessterminal in remote medical surgery, and a wireless terminal in smartgrid, a wireless terminal in transportation safety, a wireless terminalin smart city, and a wireless terminal in smart home. The UE in thisapplication may be ultra-reliable and low-latency communications (URLLC)UE.

(2) A base station (BS) is a device in a network that connects aterminal device to a wireless network. The network device is a node in awireless access network, and may also be referred to as a network deviceor a radio access network (RAN) node (or device). Currently, someexamples of the network device are a gNB, a transmission reception point(TRP), an evolved NodeB (eNB), a radio network controller (RNC), a NodeB(NB), a base station controller (BSC), a base transceiver station (BTS),a home base station (for example, a home evolved NodeB, or a home NodeB, HNB), a baseband unit (BBU), and a wireless fidelity (Wi-Fi) accesspoint (AP). Additionally, in a network structure, the network device mayinclude a centralized unit (CU) node and distributed unit (DU) nodes.This structure separates protocol layers of an eNB in a long termevolution (LTE) system. Some protocol layer functions are centrallycontrolled by the CU, and some or all of the remaining protocol layerfunctions are distributed in the DUs that are centrally controlled bythe CU.

(3) A wake-up signal is a wake-up frame or a synchronization frame, andis used to instruct user equipment to wake up a main radio interface ofthe user equipment and instruct a main radio interface of the userequipment to receive updated system information. The wake-up signal maybe sent by a base station or the user equipment.

(4) A wake-up radio WUR interface is a WUR interface introduced to aterminal device on the basis of a traditional main radio interfaceconfigured. The main radio interface is typically in an inactive state.When a wake-up signal is received from the WUR interface, the main radiointerface is activated, and then the main radio interface and the basestation perform data communication. The wake-up radio interface is alsocalled a wake-up receiver.

(5) A main radio interface is used for data communication with a basestation, and may also be called a main communications interface or amain radio module (for example, a Wi-Fi communications module), which isnot limited in this application.

(6) System information SI update transmission control informationincludes information required for receiving updated system information,and specifically includes frequency domain resource information, timedomain resource information, and modulation and coding schemeinformation that are required for receiving the updated systeminformation. User equipment receives, according to the SI updatetransmission control information, the updated system information sent bya base station.

(7) A system information SI update indication indicates that systeminformation has been updated.

(8) A counter field is used to explicitly wake up user equipment.

(9) “A plurality of” refers to two or more than two.

In addition, it should be understood that in the descriptions ofembodiments of this application, the words “first” and “second” are usedonly for the purpose of distinguishing descriptions, and should not beunderstood as indicating or implying any relative importance, nor asindicating or imply any order.

Embodiments of this application can be applied to a scenario of awireless communications system shown in FIG. 2. A base station canperform data transmission with a plurality of UEs and can send wake-upsignals. UE is configured with a WUR interface and a main radiointerface, and receives, through the WUR interface, a wake-up signalsent by the base station. In this embodiment of this application, thewake-up signal may be sent by the base station, and received by aterminal device equipped with a WUR interface, for example, a mobilephone or a sensor; or the wake-up signal may be sent by a terminaldevice such as a mobile phone, and received by another terminal deviceequipped with a WUR interface, for example, a smartwatch or a bracelet;or the wake-up signal may be sent by a terminal device such as a mobilephone, and received by a base station equipped with a WUR interface; orthe wake-up signal may be sent by a terminal device such as a smartwatch or a bracelet, and received by a terminal device equipped with aWUR interface, for example, a mobile phone. In conclusion, a sending endof the wake-up signal should have a capability of sending a wake-upsignal, and a receiving end should be equipped with a WUR interface toreceive the wake-up signal. The wake-up signal is a collective term forall signals that can be received and decoded by the WUR interface. Forexample, the wake-up signal may be a wake-up frame or other frames,which is not limited in this application.

In this embodiment of this application, the WUR interface is in anactivated state or intermittently activated state as shown in FIG. 3.When the WUR interface is in an intermittently activated state, thewake-up signal is only received within a time period corresponding to awake-up window. This can further reduce power consumption of the UE.

The following provides a detailed description of the system informationupdating scheme in this application with reference to the drawings.

FIG. 4 shows a system information updating method provided in anembodiment of this application, which is specifically described by usingan example in which a base station is a sending end and user equipmentis a receiving end. FIG. 4 is a flowchart of the system informationupdating method. The method includes the following steps.

Step S401: The base station sends a wake-up signal to a WUR interface ofthe user equipment, where the wake-up signal is used to wake up a mainradio interface of the user equipment and instruct the main radiointerface of the user equipment to receive updated system information,the wake-up signal includes system information SI update transmissioncontrol information, and the SI update transmission control informationincludes information required for receiving the updated systeminformation.

Specifically, the SI update transmission control information includesfrequency domain resource information required for receiving the updatedsystem information, and the SI update transmission control informationfurther includes at least one of the following information: time domainresource information required for receiving the updated systeminformation, and modulation and coding scheme information required forreceiving the updated system information.

Step S402: The WUR interface of the user equipment receives the wake-upsignal.

Step S403: The WUR interface of the user equipment wakes up the mainradio interface of the user equipment.

Step S404: The base station sends the updated system information to themain radio interface.

Step S405: The user equipment receives, according to the SI updatetransmission control information through the woken-up main radiointerface, the updated system information sent by the base station.

In the foregoing method, the WUR interface of the user equipmentreceives the wake-up signal sent by the base station, and wakes up themain radio interface of the user equipment based on the wake-up signal.After being activated, the main radio interface receives, according tothe system information SI update transmission control informationcarried in the wake-up signal, the updated system information sent bythe base station. Because the system information SI update transmissioncontrol information carries the information required for the updatedsystem information, the user equipment may receive the updated systeminformation, that is, an updated SIB 1, according to the requiredinformation. In this way, there is no need to go through a largequantity of blind detection processes in two prior-art steps ofperforming blind detection to receive a paging message and thenperforming blind detection to receive the SIB 1, reducing powerconsumption of the user equipment.

In a possible implementation, after step S402, the base station receivesfeedback information sent by the WUR interface.

Specifically, the feedback information may be one ACK feedback or agroup of ACK feedbacks.

In this embodiment of this application, the wake-up signal is asynchronization frame and/or a wake-up frame, where the wake-up frame isa broadcast frame, a unicast frame, or a multicast frame, that is, thewake-up signal may be a synchronization frame, a wake-up frame, or asynchronization frame and a wake-up frame. The following gives examplesof the three cases for description.

Case 1: When the wake-up signal is the wake-up frame, the WUR interfaceof the user equipment receives the wake-up frame sent by the basestation, where the wake-up frame includes the SI update transmissioncontrol information.

Specifically, a system information updating interaction process betweenthe base station and the user equipment in Case 1 may be shown in FIG.5.

The WUR interface, in an active state, of the user equipment receives,within a period, the wake-up frame sent by the base station, and wakesup the main radio interface of the user equipment. The user equipmentreceives, within the period in which the main radio interface is in theactive state, the updated system information sent by the base station.The updated system information includes a system information block (SIB)1, and other system information (OSI). The OSI refers to SIBs 2 to 21,and the WUR interface is in an inactive state when the main radiointerface is in the active state. In this way, power consumption of theUE is reduced. The active state may be represented by an on state, andthe inactive state may be represented by an off state.

Optionally, the wake-up frame further includes an SI update indication,and the SI update indication is used to indicate that system informationhas been updated. Specifically, if the wake-up frame includes this field(that is, includes the SI update indication), the indication is anexplicit indication that the UE needs to wake up the main radiointerface and update the system information; or if the wake-up framedoes not include this field, the indication is an implicit indication,and the UE needs to wake up the main radio interface and update thesystem information once the wake-up frame includes the SI updatetransmission control information. The wake-up frame may be a broadcastframe, or may be a multicast frame or a unicast frame, which is notlimited in this embodiment of this application.

Case 2: When the wake-up signal is the synchronization frame and thewake-up frame, the WUR interface of the user equipment receives thesynchronization frame sent by the base station. The synchronizationframe includes the SI update transmission control information. After theWUR interface of the user equipment receives the synchronization framesent by the base station, the WUR interface of the user equipmentreceives the wake-up frame sent by the base station. The wake-up frameincludes an SI update indication, and the SI update indication is usedto indicate that system information has been updated.

Specifically, a system information updating interaction process betweenthe base station and the user equipment in Case 1 may be shown in FIG.6.

The WUR interface, in an active state, of the user equipment receives,within a period, the synchronization frame sent by the base station.After receiving the synchronization frame, the WUR interface, in theactive state, of the user equipment receives, within the period, thewake-up frame sent by the base station, and wakes up the main radiointerface of the user equipment. The user equipment receives, within theperiod in which the main radio interface is in the active state, theupdated system information sent by the base station. The updated systeminformation includes a system information block (SIB) 1, and othersystem information (OSI). The OSI refers to SIBs 2 to 21, and the WURinterface is in an inactive state when the main radio interface is inthe active state. In this way, power consumption of the UE is reduced.The active state may be represented by an on state, and the inactivestate may be represented by an off state.

In Case 2, the wake-up frame must include the SI update indication, andthe SI update indication is used to indicate that system information hasbeen updated, to explicitly instruct the UE to wake up the main radiointerface and update the system information. The wake-up frame may be abroadcast frame, or may be a multicast frame or a unicast frame, whichis not limited in this embodiment of this application.

Case 3: When the wake-up signal is the synchronization frame, that theWUR interface of the user equipment receives the wake-up signal sent bythe base station includes: the WUR interface of the user equipmentreceives the synchronization frame sent by the base station, where thesynchronization frame includes the SI update transmission controlinformation.

Specifically, a system information updating interaction process betweenthe base station and the user equipment in Case 1 may be shown in FIG.7.

The WUR interface, in an active state, of the user equipment receives,within a period, the synchronization frame sent by the base station, andwakes up the main radio interface of the user equipment when thesynchronization frame carries the SI update transmission controlinformation. The user equipment receives, within the period in which themain radio interface is in the active state, the updated systeminformation sent by the base station. The updated system informationincludes a system information block (SIB) 1, and other systeminformation (OSI). The OSI refers to SIBs 2 to 21, and the WUR interfaceis in an inactive state when the main radio interface is in the activestate. In this way, power consumption of the UE is reduced. The activestate may be represented by an on state, and the inactive state may berepresented by an off state. When the synchronization frame does notcarry the SI update transmission control information, the UE considersthat the current system information has not changed and does not performthe operation of waking up the main radio interface. This implementationis an implicit indication that instructs whether to wake up the mainradio interface through the synchronization frame.

Optionally, the synchronization frame further includes an SI updateindication, and the SI update indication is used to indicate that systeminformation has been updated. Specifically, the SI update indication iscarried by a counter field, and a value of the counter field is used toindicate that system information has been updated. If the value of thecounter field is different from a counter value prestored by the userequipment, the system information has changed; if the value of thecounter field is the same as a counter value prestored by the userequipment, the system information has not changed. This implementationis an explicit indication.

For example, if the synchronization frame carries the SI updatetransmission control information, and the value of the counter field isdifferent from the local counter value previously stored by the UE, itis considered that the system information has changed, and the UE wakesup the main radio interface to receive the updated system information byusing the indicated SI update transmission control information.

In this embodiment of this application, how system information isupdated is described through the foregoing three cases. With theforegoing implementations, the UE avoids a large quantity of prior-artblind detection processes of first performing blind detection to receivea paging message and then performing blind detection to receive thesystem information block 1, and may directly receive the updated SIB 1according to the required information. This reduces power consumption ofthe UE. Specifically, a schematic diagram of receiving the updatedsystem information in the prior art and this application is shown inFIG. 8.

In an optional implementation, if the synchronization frame does notcarry the SI update transmission control information, and the value ofthe counter field is different from the local counter value previouslystored by the UE, it is considered that the system information haschanged. In this case, because neither the synchronization frame nor thewake-up frame carries the SI update transmission control information,the UE wakes up the main radio interface to directly obtain SItransmission resource information by using a system information radionetwork temporary identity (SI-RNTI) to descramble a physical downlinkcontrol channel.

Based on the same inventive concept as the method embodiment, thisapplication further provides a possible schematic diagram of userequipment. As shown in FIG. 9, the user equipment includes: a WURinterface 901, configured to receive a wake-up signal sent by a basestation, where the wake-up signal is used to instruct the user equipmentto wake up a main radio interface of the user equipment and instruct themain radio interface of the user equipment to receive updated systeminformation, the wake-up signal includes system information SI updatetransmission control information, and the SI update transmission controlinformation includes information required for receiving the updatedsystem information; and a processing unit 902 (which may specifically bea processor), configured to wake up the main radio interface of the userequipment after the WUR interface receives the wake-up signal, where theprocessing unit 902 may be a processing unit or processor in the WURinterface of the user equipment, or may be a processor of the userequipment (that is, a processor in the user equipment that isindependent of the WUR interface of the user equipment); the main radiointerface 903, configured to, after being woken up by the processingunit 902, receive, according to the SI update transmission controlinformation, the updated system information sent by the base station. Atrigger signal shown in FIG. 9 may have alternative names, for example,a trigger message, and is used to wake up the main radio interface. Insome embodiments, the WUR interface may send a trigger signal to themain radio interface, or the WUR interface may forward a receivedwake-up signal to the processor, and the processor determines whether towake up the main radio module. In this case, the trigger signal isactually sent by the processor, or sent by the WUR interface or anothermodule under instruction of the processor. The main radio interface 903may be, for example, directly woken up by the trigger signal sent by theprocessor of the user equipment, or indirectly woken up by the processorof the user equipment through the WUR interface, or directly woken up bythe WUR interface, or indirectly woken up by the WUR interface throughthe processor of the user equipment, which is not limited in thisapplication.

Based on the same inventive concept as the method embodiment, thisapplication further provides a schematic diagram of a base station. Asshown in FIG. 10, the base station includes: a first transceiver unit1001, configured to send a wake-up signal, where the wake-up signal isused to instruct the user equipment to wake up a main radio interface ofthe user equipment and instruct the main radio interface of the userequipment to receive updated system information, the wake-up signalincludes system information SI update transmission control information,the SI update transmission control information includes informationrequired for receiving the updated system information, where, in oneembodiment, the first transceiver unit 1001 may be a WUR interface ofthe base station, and in another embodiment, the first transceiver unit1001 may be a main radio interface of the base station; and a secondtransceiver unit 1002, configured to send the updated system informationto the woken-up main radio interface of the user equipment, where thesecond transceiver unit may be the main radio interface of the basestation. For a structure of the base station in an embodiment, referencemay be made to the structure of the user equipment in FIG. 9.

In embodiments of this application, the module division is an exampleand merely logical function division, and there may be another divisionmanner in actual implementation. In addition, the functional modules inthe embodiments of this application may be integrated into oneprocessor, or each of the modules may exist alone physically, or two ormore modules may be integrated into one module. The integrated modulemay be implemented in a form of hardware, or may be implemented in aform of a software functional module.

The user equipment in this application may also be shown in FIG. 11.Referring to FIG. 11, UE 1100 may include a processor 1101, a memory1102, a transceiver 1103, a receiver 1105, and a bus 1104. Thetransceiver 1103 is configured as a main communications interface forsending and receiving a signal (for example, an LTE/NR signal) to andfrom the main communications interface, and the receiver 1105 isconfigured as a WUR interface for receiving a wake-up signal. Theprocessor 1101, the memory 1102, and the transceiver 1103 are connectedto each other through the bus 1104. The bus 1104 may be a PCI bus, anEISA bus, or the like. The bus 1104 may be classified into an addressbus, a data bus, a control bus, and the like. For ease ofrepresentation, only one thick line is used to represent the bus in FIG.11, but this does not mean that there is only one bus or only one typeof bus.

An embodiment of this application further provides a non-volatilestorage medium. The non-volatile storage medium stores one or morepieces of program code. When the processor 1101 of the user equipment1100 executes the program code, the user equipment 1100 executes relatedmethod steps performed by the user equipment in any one of the methodembodiments of this application.

The user equipment 1100 provided in this embodiment of this applicationcan execute the related method steps performed by the user equipment inany one of the method embodiments of this application. For the detaileddescription of the modules and technical effects brought by performing,by the modules, the related method steps performed by the user equipmentin any one of the method embodiments of this application, reference maybe made to the related descriptions in the method embodiments of thisapplication, and details are not described herein again.

The base station in this application may also be shown in FIG. 12.Referring to FIG. 12, a base station 1200 may include a processor 1201,a memory 1202, a transceiver 1203, and a bus 1204. The transceiver 1203is configured as a main communications interface for sending andreceiving a signal (for example, an LTE/NR signal) to and from the maincommunications interface. In an embodiment, the transceiver 1203 isconfigured as the main communications interface and may also beconfigured to send a wake-up signal. The processor 1201, the memory1202, and the transceiver 1203 are connected to each other through thebus 1204. The system bus 1204 may be a peripheral component interconnect(PCI for short) bus, an extended industry standard architecture (EISAfor short) bus, and or the like. The bus 1204 may be classified into anaddress bus, a data bus, a control bus, and the like. For ease ofrepresentation, only one thick line is used to represent the bus in FIG.12, but this does not mean that there is only one bus or only one typeof bus. In some embodiments, the base station 1200 may further include areceiver, which may specifically be a WUR interface, configured toreceive a WUR signal or message.

If the WUR interface has a capability of sending a WUR signal or messageand does not need to send the WUR signal or message through the maincommunications interface, in some other embodiments, the base station1200 shown in FIG. 12 may further include a transmitter 1205. Thetransceiver 1203 is configured as a main communications interface (inother words, a main communications interface may be used to substitutefor the transceiver 1203) for sending and receiving a signal (forexample, an LTE/NR signal) to and from the main communicationsinterface, and the transmitter 1205 is configured as a WUR interface (inother words, a WUR interface may be used to substitute for thetransmitter 1205) for sending the wake-up signal.

This application further provides a non-volatile storage medium. Thenon-volatile storage medium stores one or more pieces of program code.When the processor 1201 of the base station 1200 executes the programcode, the base station 1200 executes related method steps performed bythe base station in any one of the method embodiments of thisapplication.

The base station 1200 provided in this embodiment of this applicationcan execute the related method steps performed by the base station inany one of the method embodiments of this application. For the detaileddescription of the modules or units and technical effects brought byperforming, by the modules or units, the related method steps performedby the base station in any one of the method embodiments of thisapplication, reference may be made to the related descriptions in themethod embodiments of this application, and details are not describedherein again.

A schematic diagram of a system including the base station and the userequipment according to the embodiments of this application may be shownin FIG. 13.

A person skilled in the art should understand that the embodiments ofthis application may be provided as a method, a system, or a computerprogram product. Therefore, this application may use a form of hardwareonly embodiments, software only embodiments, or embodiments with acombination of software and hardware. Moreover, this application may usea form of a computer program product that is implemented on one or morecomputer-usable storage media (including but not limited to a diskmemory, a CD-ROM, an optical memory, and the like) that include computerusable program code.

In the embodiments of this application, the base station may be referredto as a network device, and the user equipment may be referred to as aterminal device.

An embodiment of this application provides a network device. The networkdevice provides functions of implementing the behaviors of the networkdevice in any one of the foregoing method embodiments. The functions maybe implemented through hardware, or may be implemented by executingcorresponding software by the hardware. The hardware or softwareincludes one or more modules that correspond to sub-functions of theforegoing functions. Optionally, the network device may be a basestation.

An embodiment of this application provides a terminal device. Theterminal device provides functions of implementing the behaviors of theterminal device in any one of the foregoing method embodiments. Thefunctions may be implemented through hardware, or may be implemented byexecuting corresponding software by the hardware. The hardware orsoftware includes one or more modules that correspond to sub-functionsof the foregoing functions. Optionally, the terminal device may be userequipment.

An embodiment of this application further provides a communicationssystem, and the system includes the network device and the terminaldevice that are described in any one of the foregoing embodiments.

An embodiment of this application further provides a computer-readablestorage medium in which a computer program is stored. When the computerprogram is executed by a computer, a method process related to theterminal device in any of the foregoing method embodiments isimplemented. Specifically, the computer may be the foregoing terminaldevice.

An embodiment of this application further provides a computer-readablestorage medium on which a computer program is stored. When the computerprogram is executed by a computer, a method process related to thenetwork device in any of the foregoing method embodiments isimplemented. Specifically, the computer may be the foregoing networkdevice.

An embodiment of this application further provides a computer program ora computer program product including a computer program. When thecomputer program is executed on a computer, the computer is enabled toimplement a method process related to the terminal device in any one ofthe foregoing method embodiments. Specifically, the computer may be theforegoing terminal device.

An embodiment of this application further provides a computer program ora computer program product including a computer program. When thecomputer program is executed on a computer, the computer is enabled toimplement a method process related to the network device in any one ofthe foregoing method embodiments. Specifically, the computer may be theforegoing network device.

An embodiment of this application further provides a chip, including aprocessing module and a communications interface. The processing moduleis capable of executing a method process related to the terminal devicein any one of the foregoing method embodiments. Further, the chipfurther includes a storage module (for example, a memory). The storagemodule is configured to store an instruction. The processing module isconfigured to: execute the instruction stored in the storage module, anddue to the execution of the instruction stored in the processing module,the processing module is enabled to execute a method process related tothe terminal device in any one of the foregoing method embodiments. Thechip may be a system on chip (SoC).

An embodiment of this application further provides a chip, including aprocessing module and a communications interface. The processing moduleis capable of executing a method process related to the network devicein any one of the foregoing method embodiments. Further, the chipfurther includes a storage module (for example, a memory). The storagemodule is configured to store an instruction. The processing module isconfigured to: execute the instruction stored in the storage module, anddue to the execution of the instruction stored in the processing module,the processing module is enabled to execute a method process related tothe network device in any one of the foregoing method embodiments. Thechip may be an SoC.

It should be understood that, the processor mentioned in the embodimentsof this application may be a central processing unit (CPU), theprocessor may further be another general purpose processor, a digitalsignal processor (DSP), an application specific integrated circuit(ASIC), a field programmable gate array (FPGA), or another programmablelogic device, discrete gate or transistor logic device, discretehardware component, or the like. The general purpose processor may be amicroprocessor, or the processor may be any conventional processor orthe like.

It may be understood that the memory mentioned in the embodiments ofthis application may be a volatile memory or a nonvolatile memory, ormay include a volatile memory and a nonvolatile memory. The nonvolatilememory may be a read-only memory (ROM), a programmable read-only memory(PROM), an erasable programmable read-only memory (EPROM), anelectrically erasable programmable read-only memory (EEPROM), or a flashmemory. The volatile memory may be a random access memory (RAM), used asan external cache. Through example but not limitative description, manyforms of RAMs may be used, for example, a static random access memory(Static RAM, SRAM), a dynamic random access memory (Dynamic RAM, DRAM),a synchronous dynamic random access memory (Synchronous DRAM, SDRAM), adouble data rate synchronous dynamic random access memory (Double DataRate SDRAM, DDR SDRAM), an enhanced synchronous dynamic random accessmemory (Enhanced SDRAM, ESDRAM), a synchlink dynamic random accessmemory (Synchlink DRAM, SLDRAM), and a direct rambus random accessmemory (Direct Rambus RAM, DR RAM).

It should be noted that the memory described in this specification isintended to include, but is not limited to, these memories and any otherappropriate types of memories.

It should also be understood that the first, second, and other numericalnumbers in this specification are only for ease of description and arenot intended to limit the scope of this application.

The term “and/or” in this specification describes only an associationrelationship for describing associated objects and represents that threerelationships may exist. For example, A and/or B may represent thefollowing three cases: Only A exists, both A and B exist, and only Bexists. In addition, the character “/” in this specification generallyindicates an “or” relationship between the associated objects.

It should be understood that the sequence numbers of the foregoingprocesses do not mean execution sequences in the embodiments of thisapplication. Some or all steps may be performed in parallel or insequence. The execution sequences of the processes should be determineddepending on functions and internal logic of the processes, and shouldnot be construed as any limitation on the implementation processes ofthe embodiments of this application.

A person of ordinary skill in the art may be aware that, in combinationwith the examples described in the embodiments disclosed in thisspecification, units and algorithm steps may be implemented byelectronic hardware or a combination of computer software and electronichardware. Whether the functions are performed by hardware or softwaredepends on particular applications and design constraint conditions ofthe technical solutions. A person skilled in the art may use differentmethods to implement the described functions for each particularapplication, but it should not be considered that the implementationgoes beyond the scope of this application.

It may be clearly understood by a person skilled in the art that, forthe purpose of convenient and brief description, for a detailed workingprocess of the foregoing system, apparatus, and unit, refer to acorresponding process in the foregoing method embodiments, and detailsare not described herein again.

In the several embodiments provided in this application, it should beunderstood that the disclosed system, apparatus, and method may beimplemented in other manners. For example, the described apparatusembodiment is merely an example. For example, the unit division ismerely logical function division and may be other division in actualimplementation. For example, a plurality of units or components may becombined or integrated into another system, or some features may beignored or not performed. In addition, the displayed or discussed mutualcouplings or direct couplings or communication connections may beimplemented by using some interfaces. The indirect couplings orcommunication connections between the apparatuses or units may beimplemented in electronic, mechanical, or other forms.

The units described as separate parts may or may not be physicallyseparate. Parts displayed as units may or may not be physical units, andmay be located in one position or may be distributed on a plurality ofnetwork units. Some or all of the units may be selected based on actualrequirements to achieve the objectives of the solutions of theembodiments.

In addition, functional units in the embodiments of this application maybe integrated into one processing unit, or each of the units may existalone physically, or two or more units are integrated into one unit.

When the functions are implemented in the form of a software functionalunit and sold or used as an independent product, the functions may bestored in a computer-readable storage medium. Based on such anunderstanding, the technical solutions of this application essentially,or the part contributing to the prior art, or all or some of thetechnical solutions may be implemented in the form of a softwareproduct. The computer software product is stored in a storage medium andincludes several instructions for instructing a computer device (whichmay be a personal computer, a server, a network device, or a terminaldevice) to perform all or some of the steps of the methods described inthe embodiments of this application. The foregoing storage mediumincludes: any medium that can store program code, such as a USB flashdrive, a removable hard disk, a read-only memory (ROM), a random accessmemory (RAM), a magnetic disk, or an optical disc.

Related parts of the method embodiments of this application may bemutually referenced. The apparatuses provided in the apparatusembodiments are configured to execute the methods provided in thecorresponding method embodiments. Therefore, for the apparatusembodiments, reference may be made to the related parts in the relatedmethod embodiments.

The apparatus structural diagrams provided in the apparatus embodimentsof this application merely show simplified designs of the correspondingapparatus. In practical application, the apparatus may include anyquantity of transmitters, receivers, processors, memories, and the like,to implement the functions or operations executed by the apparatus inthe apparatus embodiments of this application, and all apparatuses thatcan implement this application fall within the scope of protection ofthis application.

Names of messages/frames/indication information, modules or units, andthe like provided in the embodiments of this application are merelyexamples, and other names may be used provided that functions of themessages/frames/indication information, the modules or units, and thelike are the same.

The terms used in the embodiments of this application are merely for thepurpose of illustrating specific embodiments, and are not intended tolimit this application. The terms “a”, “said” and “the” of singularforms used in the embodiments and the appended claims of thisapplication are also intended to include plural forms, unless otherwisespecified in the context clearly. It should also be understood that, theterm “and/or” used herein indicates and includes any or all possiblecombinations of one or more associated listed items. In addition, thecharacter “/” in this specification generally indicates an “or”relationship between the associated objects.

Depending on the context, for example, words “if” used herein may beexplained as “while” or “when” or “in response to determining” or “inresponse to detection”. Similarly, depending on the context, phrases “ifdetermining” or “if detecting (a stated condition or event)” may beexplained as “when determining” or “in response to determining” or “whendetecting (the stated condition or event)” or “in response to detecting(the stated condition or event)”.

A person of ordinary skill in the art can understand that all or some ofthe steps in the foregoing method embodiments may be completed by aprogram instructing related hardware. The program may be stored in areadable storage medium of a device. All or some of the steps areincluded during execution of the program. The storage medium is, forexample, a flash drive or an EEPROM.

In the foregoing specific implementations, the objective, technicalsolutions, and benefits of this application have been further describedin detail. It should be understood that different embodiments can becombined. The foregoing descriptions are merely specific implementationsof this application, but are not intended to limit the protection scopeof this application. Any combination, modification, equivalentreplacement, or improvement made without departing from the spirit andprinciple of this application should fall within the protection scope ofthis application.

What is claimed is:
 1. A system information updating method comprising:receiving, by a wake-up radio (WUR) interface of user equipment, awake-up signal sent by a base station, wherein the wake-up signalinstructs the user equipment to wake up a main radio interface of theuser equipment and instructs the main radio interface of the userequipment to receive updated system information, the wake-up signalcomprises system information (SI) update transmission controlinformation, and the SI update transmission control informationcomprises information required for receiving the updated systeminformation; waking up, by the user equipment, the main radio interfaceof the user equipment after the WUR interface of the user equipmentreceives the wake-up signal; and receiving, by the user equipmentaccording to the SI update transmission control information that isreceived through the WUR interface, the updated system information sentby the base station through the woken-up main radio interface.
 2. Userequipment comprising: a wake-up radio (WUR) interface, configured toreceive a wake-up signal sent by a base station, wherein the wake-upsignal instructs the user equipment to wake up a main radio interface ofthe user equipment and instructs the main radio interface of the userequipment to receive updated system information, the wake-up signalcomprises system information (SI) update transmission controlinformation, and the SI update transmission control informationcomprises information required for receiving the updated systeminformation; a processor, configured to wake up the main radio interfaceof the user equipment after the WUR interface receives the wake-upsignal; and the main radio interface, configured to, after beingwoken-up, receive, according to the SI update transmission controlinformation that is received through the WUR interface, the updatedsystem information sent by the base station.
 3. The user equipmentaccording to claim 2, wherein the SI update transmission controlinformation comprises frequency domain resource information required forreceiving the updated system information.
 4. The user equipmentaccording to claim 3, wherein the SI update transmission controlinformation further comprises at least one of the following information:time domain resource information required for receiving the updatedsystem information, and modulation and coding scheme informationrequired for receiving the updated system information.
 5. The userequipment according to claim 2, wherein the wake-up signal is asynchronization frame and/or a wake-up frame, and the wake-up frame is abroadcast frame, a unicast frame, or a multicast frame.
 6. The userequipment according to claim 5, wherein in response to the wake-upsignal being the wake-up frame, the WUR interface is configured to:receive the wake-up frame sent by the base station, wherein the wake-upframe comprises the SI update transmission control information.
 7. Theuser equipment according to claim 6, wherein the wake-up frame furthercomprises an SI update indication, and the SI update indicationindicates that system information has been updated.
 8. The userequipment according to claim 5, wherein in response to the wake-upsignal including both the synchronization frame and the wake-up frame,the WUR interface of the user equipment is configured to: receive thesynchronization frame sent by the base station, wherein thesynchronization frame comprises the SI update transmission controlinformation; and after the WUR interface of the user equipment receivesthe synchronization frame sent by the base station, receive the wake-upframe sent by the base station, wherein the wake-up frame comprises anSI update indication, and the SI update indication indicates that systeminformation has been updated.
 9. The user equipment according to claim5, wherein in response to the wake-up signal being the synchronizationframe, the WUR interface is configured to: receive the synchronizationframe sent by the base station, wherein the synchronization framecomprises the SI update transmission control information.
 10. The userequipment according to claim 9, wherein the synchronization framefurther comprises an SI update indication, and the SI update indicationindicates that system information has been updated.
 11. The userequipment according to claim 8, wherein the SI update indication iscarried by a counter field in the synchronization frame, and a value ofthe counter field indicates that the system information has beenupdated.
 12. A base station comprising: a first transceiver, configuredto send a wake-up signal to a wake-up radio (WUR) interface of userequipment, wherein the wake-up signal instructs the user equipment towake up a main radio interface of the user equipment and instructs themain radio interface of the user equipment to receive updated systeminformation, the wake-up signal comprises system information (SI) updatetransmission control information, and the SI update transmission controlinformation comprises information required for receiving the updatedsystem information; and a second transceiver, configured to send theupdated system information to the woken-up main radio interface of theuser equipment for the user equipment to receive the updated systeminformation according to the SI update transmission control informationthat is sent to the WUR interface of the user equipment.
 13. The basestation according to claim 12, wherein the SI update transmissioncontrol information comprises frequency domain resource informationrequired for receiving the updated system information.
 14. The basestation according to claim 13, wherein the SI update transmissioncontrol information further comprises at least one of the followinginformation: time domain resource information required for receiving theupdated system information, and modulation and coding scheme informationrequired for receiving the updated system information.
 15. The basestation according to claim 12, wherein the wake-up signal is asynchronization frame and/or a wake-up frame, and the wake-up frame is abroadcast frame, a unicast frame, or a multicast frame.
 16. The basestation according to claim 15, wherein in response to the wake-up signalbeing the wake-up frame, the first transceiver is configured to: sendthe wake-up frame to the WUR interface of the user equipment, whereinthe wake-up frame comprises the SI update transmission controlinformation.
 17. The base station according to claim 16, wherein thewake-up frame further comprises an SI update indication, and the SIupdate indication indicates that system information has been updated.18. The base station according to claim 15, wherein in response to thewake-up signal including both the synchronization frame and the wake-upframe, the first transceiver is configured to: send the synchronizationframe to the WUR interface of the user equipment, wherein thesynchronization frame comprises the SI update transmission controlinformation; and after the first transceiver sends the synchronizationframe to the WUR interface of the user equipment, send the wake-up frameto the WUR interface of the user equipment, wherein the wake-up framecomprises an SI update indication, and the SI update indicationindicates that system information has been updated.
 19. The base stationaccording to claim 15, wherein in response to the wake-up signal beingthe synchronization frame, the first transceiver is configured to: sendthe synchronization frame to the WUR interface of the user equipment,wherein the synchronization frame comprises the SI update transmissioncontrol information.
 20. The base station according to claim 19, whereinthe synchronization frame further comprises an SI update indication, andthe SI update indication indicates that system information has beenupdated.